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15 cards from this deck
46 chromosomes in 23 pairs
22 pairs (44 chromosomes)
1 pair (2 chromosomes)
X and Y chromosomes
XX
XY
X chromosome
Approximately 1,000 genes
Fewer than 100 genes
The father/male parent
Either X or Y chromosome
At the moment of fertilisation
Heterogametic sex
Homogametic sex
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